Удалить определенный КЕШ сайта

<?php

@error_reporting ( E_ALL ^ E_WARNING ^ E_NOTICE );
@ini_set ( 'display_errors', true );
@ini_set ( 'html_errors', false );
@ini_set ( 'error_reporting', E_ALL ^ E_WARNING ^ E_NOTICE );

define ( 'DATALIFEENGINE', true );
define ( 'ROOT_DIR', '.' );
define ( 'ENGINE_DIR', ROOT_DIR . '/engine' );

function clear_cache($cache_areas = false) {

    if( $cache_areas ) {
        if( !is_array($cache_areas) ) {
            $cache_areas = array($cache_areas);
        }
    }

    $fdir = opendir( ENGINE_DIR . '/cache' );

    while ( $file = readdir( $fdir ) ) {
        if( $file != '.' and $file != '..' and $file != '.htaccess' and $file != 'system' ) {
            if( $cache_areas ) {
                foreach( $cache_areas as $cache_area ) if( strpos( $file, $cache_area ) !== false ) @unlink( ENGINE_DIR . '/cache/' . $file );
            } else {
                @unlink( ENGINE_DIR . '/cache/' . $file );
            }
        }
    }
}

clear_cache( array('news_', 'topnews_', 'rss') );

?>